Synthesis and electrochemical performance of Li4Ti5O12/TiO2/C nanocrystallines for high-rate lithium ion batteries

Wenjun Zhu; Hui Yang; Wenkui Zhang; Hui Huang; Xinyong Tao; Yang Xia; Yongping Gan; Xingzhong Guo

doi:10.1039/C5RA12397F

Synthesis and electrochemical performance of Li₄Ti₅O₁₂/TiO₂/C nanocrystallines for high-rate lithium ion batteries†

Wenjun Zhu,^a Hui Yang,^a Wenkui Zhang,^b Hui Huang,^b Xinyong Tao,^b Yang Xia,^b Yongping Gan^b and Xingzhong Guo*^a

* Corresponding authors

^a School of Materials Science and Engineering, Zhejiang University, 38 Zheda Road, Xihu District, Hangzhou 310027, China
E-mail: msewj01@zju.edu.cn
Fax: +86 571 87953054

^b College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China

Abstract

A Li₄Ti₅O₁₂/TiO₂/carbon (Li₄Ti₅O₁₂/TiO₂/C) nanocrystalline composite has been successfully synthesized by a facile sol–gel method and subsequent calcination treatment. Moreover, pure Li₄Ti₅O₁₂, Li₄Ti₅O₁₂/C and Li₄Ti₅O₁₂/TiO₂ composites have also been synthesized for comparison. All the samples present a nanocrystalline structure with a uniform size distribution, and abundant phase interfaces can be detected for the Li₄Ti₅O₁₂/TiO₂ and Li₄Ti₅O₁₂/TiO₂/C composites. Electrochemical measurements demonstrate that the resultant Li₄Ti₅O₁₂/TiO₂/C composite exhibits a superior rate capability and cycle stability in comparison with pure Li₄Ti₅O₁₂, Li₄Ti₅O₁₂/C and Li₄Ti₅O₁₂/TiO₂ composites, which can be attributed to a high grain boundary density, abundant phase interfaces and in situ formed carbon, for storing extra lithium ions, enhancing rapid lithium insertion/extraction kinetics and improving the electron transport rate.

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Article information

DOI: https://doi.org/10.1039/C5RA12397F
Article type: Paper
Submitted: 26 Jun 2015
Accepted: 24 Aug 2015
First published: 24 Aug 2015

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RSC Adv., 2015,5, 74774-74782

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Synthesis and electrochemical performance of Li₄Ti₅O₁₂/TiO₂/C nanocrystallines for high-rate lithium ion batteries

W. Zhu, H. Yang, W. Zhang, H. Huang, X. Tao, Y. Xia, Y. Gan and X. Guo, RSC Adv., 2015, 5, 74774 DOI: 10.1039/C5RA12397F

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